2002 GMC Sierra 2500 HD Reviews

2002 GMC Sierra 2500 HD Reviews and Owner Comments

2002 GMC Sierra 2500 HD (2 Reviews)
Body, Interior & Misc.
Drive Train
Electrical & Lights
Exhaust & Emissions
Heating & Air Conditioning
Suspension & Steering
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Why did my inside/outside a.c. door quit working. Button dash lights up but door does not move. 2002 GMC Sierra 2500hd duramax

I started to here a pulsation noise behind my glove box area about every 30 seconds. With my hand I reached under and located the noise against the fire wall. I found a damper that was opening and closing back and fourth. Then found out I have a cabin air filter; changed them out with new ones. Thought that would be the problem, but I still have this damper wanting to pulse back and fourth from open to close. I pushed the damper with my hand a few times but it still wants to go from open to close. Is this some sort of a vacuum problem or maybe an electrical signal telling this damper to go back and fourth? I think this is a damper to bring in outside air into the truck cabin.